Bug 74621

On OSX there are specific places to keep preferences and cache files. There are
numerous advantages to putting files in these places:

* modules saved within the application are lost when the application is upgraded
(many OSX users are used to replacing the entire application during an upgrade)

* .netbeans is invisible in the Finder and this makes it awkward to edit its
contents

* ~/Library/Application Support/Netbeans/ is a good place for user specific modules

* /Library/Application Support/Netbeans is a good place for system wide modules

* ~/Library/Preferences/Netbeans is where a user would expect to find their
preferences

* ~/Library/Caches/Netbeans is where cache files should go

* By putting files in these places many OSX features work better: users who have
file server mounted home directories would normally point ~/Library/Caches/ to a
local disk; automated backup scripts usually look for preferences in the
Preferences folder; users who migrate to a new home directory would often miss
an invisible .netbeans folder; etc.

Hopefully these changes are relatively easy to accomplish.